Linux Partitioning of more than 2GB Disk

So just wanted to share how to partition your hard drive from Linux command line if you have a drive greater than 2GB.

In my case its 3TB and i want to create a single partition out of it.

I used “gdisk” , its similar to “fdisk” but can create and understand large disk partitioning system.

 root@M-PVPS:/# gdisk /dev/sdb

GPT fdisk (gdisk) version 0.8.5

Partition table scan:
MBR: MBR only
BSD: not present
APM: not present
GPT: not present
***************************************************************
Found invalid GPT and valid MBR; converting MBR to GPT format.
THIS OPERATION IS POTENTIALLY DESTRUCTIVE! Exit by typing ‘q’ if
you don’t want to convert your MBR partitions to GPT format!
***************************************************************
Command (? for help):

Now we will type “p” to print partition table.

Number Start (sector) End (sector) Size Code Name
1 2048 52889599 25.2 GiB 0700 #####
2 209713152 216107007 3.0 GiB 0700 #####

Now i will delete the available partition with “d”

Command (? for help): d
Partition number (1-2): 1

Now i will delete the 2nd partition with “d” and then typing “2”

Now i will print the partitioning table with “p”

Command (? for help): p
Disk /dev/sdb: 5860533168 sectors, 2.7 TiB
Logical sector size: 512 bytes
Disk identifier (GUID): 7F138376-657F-441A-B784-96E22BDAB49D
Partition table holds up to 128 entries
First usable sector is 34, last usable sector is 5860533134
Partitions will be aligned on 2048-sector boundaries
Total free space is 5860533101 sectors (2.7 TiB)

Now i will create the partition with “n” and selecting all the default values.

Command (? for help): n
Partition number (1-128, default 1):
First sector (34-5860533134, default = 2048) or {+-}size{KMGTP}:
Last sector (2048-5860533134, default = 5860533134) or {+-}size{KMGTP}:
Current type is ‘Linux filesystem’
Hex code or GUID (L to show codes, Enter = 8300):
Changed type of partition to ‘Linux filesystem’

Now i will print the partition table with “p”

Number  Start (sector)    End (sector)  Size       Code  Name
1            2048      5860533134   2.7 TiB     8300  Linux filesystem

Now we will write and save partition with “w” command.

Command (? for help): w

Final checks complete. About to write GPT data. THIS WILL OVERWRITE EXISTING
PARTITIONS!!

Do you want to proceed? (Y/N): y
OK; writing new GUID partition table (GPT) to /dev/sdb.
The operation has completed successfully.

Now we will create the file system with “mkfs -t ext3 /dev/sdb” command

root@M-PVPS:/# mkfs -t ext3 /dev/sdb1
mke2fs 1.42.5 (29-Jul-2012)
/dev/sdb is entire device, not just one partition!
Proceed anyway? (y,n) y

Now you can check the drive with df -h command

 

 

 

Linux Practical Security Course

Dear Members ,
I am happy to announce that Linux Practical Security by LZH Project is complete. We will launch it shortly. Please support us by buying and rating this course. For first 20 buyers there will be a discount of $5. Total cost is $25. You can also book your copy by sending me email to learning@itpings.com Please take a look at the introductory video here:

Openstack dashboard gives error “Error: Unable to retrieve information”

So today i ran into one more issue with Openstack , the error showed up  when i logged in to the dashboard and clicked on Project–>Instances.

What i saw terrified me because is saw “NOTHING” !

A day before i had the same issue and i thought it’s related to RAM so i restarted and everything started and operated normally, but this time the reboot didn’t help.

So i started scratching my head and started wondering what might be the reason. I searched internet but no success. I searched log files but nothing made sense at that time, so i rebooted one more time and an Error appeared saying something like “Openstack glance-registry api error limit reached ” So that gave me a head start that it has something to do with system being low in space.

A df -h showed that / is 100% full. I removed some unnecessary files , rebooted the system and Viola !

All started to work Normally.

Conclusion:

Make Sure you have enough space with OpenStack

 

Unable to Connect “The Squid Error “

So today i had a strange problem when i was only able to access google.com and not other sites. I was able to browse gmail, but not mail ru. Everything was working fine but out of no where this error “Unable to Connect” appeared on my Browsers. It was kinda strange, since i made no changes to my system” Also i was not sure if it’s the system or the Gateway.
Observation on System:
1) Both Firefox and Chrome giving the same problem.
2) I was able to browse with Chrome if Ultrasuf Extension was enabled.
3) Firebug reported “Aborted” in the Net tab

Steps taken:

Restarted the System
Changed the IP address
Result:
System Not Fixed Continue reading

Solving Call Drop Issue in Elastix / Asterisk

If you change your Network and you find that the working Elastix / Asterisk box is now dropping calls every 15 to 25 secs.  One of the most probable reason is “NAT” .

The solution which worked for me is changing the sip_custom.conf found in /etc/asterisk/ directory.

Open it with your favorite editor such as vim or nano and add the following lines.

externip=1.1.1.1/255.0.0.0  < Your External Ip with Subnet Here >
localnet=192.168.1.0/255.255.255.0 < Your Internal Ip with Subnet Here >
canreinvite=no
NAT=Yes
Qualify=yes
promiscredir=yes

Hope this will help someone.

Thanks,
Salman

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Thanks,
Sal